LED_LEVEL_ROOM_TEMPERATURE = 0.4
LED_LEVEL_LN2 = 1.0

    
"""
wago=ch.psi.pshell.modbus.ModbusTCP|wago-mxsc-1:502|||
relays=ch.psi.pshell.modbus.DigitalOutputArray|wago 0 16||1000|
release_local_safety=ch.psi.pshell.modbus.DigitalOutput|wago 0|||
release_psys_safety=ch.psi.pshell.modbus.DigitalOutput|wago 1|||
ln2_main_power=ch.psi.pshell.modbus.DigitalOutput|wago 2|||
rim_heater=ch.psi.pshell.modbus.DigitalOutput|wago 3|||
phase_separator_ln2=ch.psi.pshell.modbus.DigitalOutput|wago 4|||
dewar_ln2=ch.psi.pshell.modbus.DigitalOutput|wago 5|||false
valve_he_chamber=ch.psi.pshell.modbus.DigitalOutput|wago 6|||
gripper_dryer=ch.psi.pshell.modbus.DigitalOutput|wago 7|||
valve_1=ch.psi.pshell.modbus.DigitalOutput|wago 8|||
valve_2=ch.psi.pshell.modbus.DigitalOutput|wago 9|||
valve_3=ch.psi.pshell.modbus.DigitalOutput|wago 10|||
valve_4=ch.psi.pshell.modbus.DigitalOutput|wago 11|||
#spare_do_1=ch.psi.pshell.modbus.DigitalOutput|wago 12|||
#spare_do_2=ch.psi.pshell.modbus.DigitalOutput|wago 13|||
#spare_do_3=ch.psi.pshell.modbus.DigitalOutput|wago 14|||
#spare_do_4=ch.psi.pshell.modbus.DigitalOutput|wago 15|||
phase_separator_level=ch.psi.pshell.modbus.ReadonlyProcessVariable|wago 0||1000|
dewar_level=ch.psi.pshell.modbus.ReadonlyProcessVariable|wago 1||1000|
rim_heater_temp=ch.psi.pshell.modbus.ReadonlyProcessVariable|wago 2||1000|
air_pressure=ch.psi.pshell.modbus.ReadonlyProcessVariable|wago 3||1000|
n2_pressure=ch.psi.pshell.modbus.ReadonlyProcessVariable|wago 4||1000|
#spare_ai_1=ch.psi.pshell.modbus.AnalogInput|wago 5|||
#spare_ai_2=ch.psi.pshell.modbus.AnalogInput|wago 6|||
#spare_ai_3=ch.psi.pshell.modbus.AnalogInput|wago 7|||
led_ctrl_1=ch.psi.pshell.modbus.ProcessVariable|wago 0|||
led_ctrl_2=ch.psi.pshell.modbus.ProcessVariable|wago 1|||
led_ctrl_3=ch.psi.pshell.modbus.ProcessVariable|wago 2|||
"""
###################################################################################################
#  Leds
###################################################################################################

def set_led_level(level):
     level = max(min(float(level),100.0),0.0)
     set_setting("led_level", level)
     led_ctrl_1.write(led_ctrl_1.config.maxValue * level / 100.0)
     led_ctrl_2.write(led_ctrl_2.config.maxValue * level / 100.0)
     led_ctrl_3.write(led_ctrl_3.config.maxValue * level / 100.0)        

def get_led_level():
    level = get_setting("led_level")
    return float(0 if level is None else level)
    
def set_led_state(value):
    """
    Turn leds on and off
    """
    if value:
        set_led_level(100.0)
    else:
        set_led_level(0.0)

def get_led_state():
    """
    Returns led state (on/off)
    """
    return led_ctrl_1.read() > 0 

#TODO: The range should be set automatically reading LN2 sensor.
def set_led_range(room_temp = True):
    """
    Led range should be limitted in room temperature
    """
    max_val = LED_LEVEL_ROOM_TEMPERATURE if room_temp else LED_LEVEL_LN2
    led_ctrl_1.config.maxValue = max_val
    led_ctrl_1.config.save()
    led_ctrl_2.config.maxValue = max_val
    led_ctrl_2.config.save()
    led_ctrl_3.config.maxValue = max_val
    led_ctrl_3.config.save()
    led_ctrl_1.initialize()
    led_ctrl_2.initialize()
    led_ctrl_3.initialize()
    if led_ctrl_1.read() > max_val:
        led_ctrl_1.write(max_val)
    if led_ctrl_2.read() > max_val:
        led_ctrl_2.write(max_val)
    if led_ctrl_3.read() > max_val:
        led_ctrl_3.write(max_val)
    set_led_level(get_led_level())


def is_led_room_temp():
    return led_ctrl_1.config.maxValue <= LED_LEVEL_ROOM_TEMPERATURE




###################################################################################################
#  Safety release
###################################################################################################

def release_local():
    """
    Release local safety
    """        
    release_local_safety.write(False)
    time.sleep(0.01)
    release_local_safety.write(True)
    time.sleep(0.01)
    release_local_safety.write(False)

def release_psys():
    """
    Release psys safety
    """    
    if is_manual_mode():
        raise Exception ("Cannot release PSYS in manual mode")
    release_psys_safety.write(False)
    time.sleep(0.01)
    release_psys_safety.write(True)
    time.sleep(0.01)
    release_psys_safety.write(False)



###################################################################################################
#  Drier
###################################################################################################
MAX_HEATER_TIME = 60000

def set_air_stream(state):
    """
    """
    valve_1.write(state)
    valve_2.write(not state)


set_heater_chrono = None

def monitor_heater_time():
    time.sleep(0.5)
    try:
        while get_heater():
            if set_heater_chrono.isTimeout(MAX_HEATER_TIME):
                set_heater(False)
                log("Heater timeout expired: turned off", False)
                return
            time.sleep(0.1)
    except:
        print sys.exc_info()


def get_heater():
    """
    """
    return gripper_dryer.read()


def set_heater(state):
    """
    """
    global set_heater_chrono
    if  get_heater() != state:
        gripper_dryer.write(state)    
        if state: 
            set_heater_chrono = Chrono()      
            fork(monitor_heater_time)


def get_air_stream():
    """
    """
    return valve_1.read()